Hoisting apparatus.



No. 867,071. y I -PATBNTED s511124, 19.07. G. A. oLsoN. y

HoIsTING APPARATUS.

APPLIGATION FILED MAB.. 28 1907.

@Wi/them@ c?) wwu Strap/lega EAR'LLlS [JAN CARL A. OLSON, OF MILAN,MINNESOTA.

HOISTING APPARATUS.

Specification of Letters Patent.

Patented sept. a4, 1907.

Application filed March 28, 1907. Serial No. 365,037.`

To all whom it may concern:

Be it known that I, CARL A, OLSON, a citizen of the United States;residing at Milan, in the county of Chippewa and Statel of Minnesota,have invented certain new `and useful Improvements in HoistingApparatuses; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others 'skilledin the art to which it appertains to make and use the same.

This inventionrelates to improvements in hoisting apparatus.

The objectof the invention is to provide an apparatus of this characterby means of which the hoisting rope or cable will be automaticallylocked, upon release of the hoisting power, by means of the weight ofthe load being hoisted.

A further object is to provide means whereby the llocking mechanism forthe hoisting cable may be quickly released.

With the foregoing and other objects in view which will appear as thenature of the invention is better understood, the invention consists incertain novel fea tures of construction, combination and arrangement ofparts as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a side view of the hoistingapparatus constructed in accordance with the invention; Fig. 2 is anedge view of the same; Fig. 3 is a longitudinal vertical sectional viewthrough the main pulley frame and the cable locking mechanism carriedthereby.

Referring more particularly to the drawings, 1 denotes the main pulleyframe which is here shownand preferably consists of a series of parallelplates 2 which are spaced apart and secured in position by means ofbolts or rivets 3 which also serve as pivot bolts for the working partsof the block. Connected to the upper pivot bolts 3 between the innerpair and the two outer plates of the frame is secured a bail 4 to whichis connected a hook 5 by means of which the main frame 1 may besuspended from and connected to a suitable support.

Pivotally mounted on the central pivot bolt 3 between the inner pair ofplates 2 is an auxiliary pulley frame 6 which consists of a pair ofhorizontally-extending plates between which near the upper edge andadjacent to one end thereof is revolubly mounted a pulley 7 whilebetween the same and adjacent to the opposite end and near the loweredge thereof is revolubly mounted a pulley 8. The plates of the frames 6are secured together at their opposite ends by rivets 9 and are spacedapart by means of sleeves 10 arranged on said rivets, f

To the lower rivet at one end of the frame 6 is connected a pulley block12, said pulley block being loosely connected to the rivet by means of abail 13. On the lowermost bolt 3 of 'the main frame l between the innerpair and the two outer plates thereof are revof lubly mounted pulleys14.

Adapted to be used in connection with the main 'pulley frame and pulleysis a triple pulley block 15 which is here shown and preferably consistsof a series of plates which are secured together byvrivets or bolts '16on4 which are arranged sleeves 17 whereby said plates are spaced apartand held in parallel relation. Revolubly mounted on a central pivot bolt18 between the inner pair of plates on the two outer plates are threepulleys 19. To the bolt 16 in the lower end of the pulley frame 15 issecured bails 2O to which is connected a hook 21 which is adapted to beconnected t0 the load to be raised or hoisted. To the bolt or rivet 16at the upper end of the frame is secured a bail 22 To the bail 22 isconnected the lower end of the hoisting cable 23, said cable passingupwardly from the bail 22 around one of the pulleys 14, the lower end ofthe main frame and from thence passes downwardly around one of thepulleys 19 in the frame 15, thence upwardly through the pulley block 12,thence downwardly around another of the pulleys 19 and the frame 15 andupwardly around the other pulley I4 in the lower end of the main frame 1and thence downwardly around the central pulley 19 of the frame 15 afterwhich the cable passes upwardly over the pulleys 7 and 8 in theauxiliary pulley frame 6 and from thence extends to and is connectedwith the operating power. By running the hoisting cable as herein shownand described, the pivoted auxiliary frame 6 will be held thereby in ahori- Zontal position when the load is applied to the hook 21 of thepulley frame I3 -and the power is applied to the opposite end of thehoisting cable.

In order that the load may be suspended in position at any desiredelevation or to prevent the same from dropping should the hoisting cablebe broken, I propvide a suitable locking mechanism whereby said cablewill be automatically gripped and held should the same be broken betweenthe hoisting mechanism and the main pulley frame. The locking mechanismfor the cable is here shown and preferably consists of a clutching orgripping lever 24 which is pivotally mounted at one end on the bolt orrivet 9 at one end of the auxiliary pulley frame 6 and projects aboveand oversaid frame as shown. The lever 24 is provided with anobliquely-disposed or cam slot 25 which is adapted to be engaged withthe upper pivot bolt 3 of the main frame 1 between the inner pair of theplates forming said frame. The outer or free end of the lever 24 is bentdownwardly and outwardly to form a cable gripping plate 26 which isadapted to be brought into tight engagement with the cable 23immediately above the pulley 7'A of the auxiliary frame 6 therebyclamping said cable between the pulley and said gripping plate andholding the same against backward movement. The gripping plate 26 isautomatically brought into -engagement with the hoisting cable bymeansmm slotted connection between said lever and the bolt 3 oi the mainfra-me and the connection of the auxiliary pulley frame which when thehoisting power is released will be tilted or swung in the trame l by theweight of the load pulling downwardly upon the pulley block l2 at oneend of the trame 6 thereby drawing said end downwardly and raising theopposite end ol the frame together with the cable which passes over thepulley 7 at this end oi the frame. The tilting or swinging movement elthe auxiliary trame G also tends to force the gripping plate 26 ot' thelever 24; downwardly by reason oi the slotted engagement ot said leverwith the main trame so that the hoisting cable is tightly gripped orclamped between the pulley 7 and the gripping plate oi the clutch lever,as will be understood.

In order to disengage the gripping lever from the cable to permit thefurther hoisting ol the load, l provide a suitable releasing mechanismwhich consists ol a lever 27 which is pivotally mounted on the centralpivot bolt 3 oi the main trame l between the inner pair oi plates andthe outer' plate on one side oi said frame. The inner end of the lever27 is loosely connected to one end of a bell-crank lever 2S which ispivotally mounted on the adjacent side oi the auxiliary pulley trame 6near one end ot the same. The opposite end or arm of the bell-cranklever 28 is pivotally connected to the upper end with alulcrum arm orbar 29, the opposite end oi which is pivotally conneeted to the lowerpivot bolt 3 of the main frame. To the free or outer end of thereleasing lever 27 is connected a releasing rope or cord 30 whichextends downwardly to within convenient reach oi the operator and isadapted when drawn upon to rock the releasing lever 27 downwardly whichwill cause the opposite or upper end ot said lever to rock thebell-crank lever which movement owing to the pivotal connection of theopposite arm of the bell-crank lever with the tulcrum arm or bar willcause the adjacent end of the auxiliary pulley trame (i to be tiltedupwardly, this movement will lift or swing the clutching lever l 24upwardly,. thereby disengaging the gripping plate 26 from the cable.This separation or disengagement of the gripping plate 26 trom the cableis also l'acilitated by the downward or opposite movement ot this end ofthe auxiliary pulley trame 6.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and operation of the invention will bereadily understood without requiring a more extended explanation.

Various changes in the iorm, proportion and the minor details ofconstruction may be resorted to without departing trom the principle orsacrificing any oi the advantages ot the invention, as defined by theappended claims.

Having thus described my invention, what I claim an auxiliary pulleyframe pivotally mounted in said main frame, pulleys arranged in saidmain frame and in said auxiliary frame. a pulley block loosely connectedto one end of said auxiliary frame, a triple pulley block. a boistingcable having one end connected to said triple block and passing aroundthe pulleys therein and the pulleys in said main and auxiliary frames,gripping means adapted to-engage the hoisting cable when the hoistingpower is released therefromand means for discngaging said gripping meansfrom said cable.

2. A hoisting` apparatus consisting' et a main pulley frame, pulleywheels lournaled in the lower end of said trame. and auxiliary pulleytrame pivotally mounted in said main traine` pulley wheels revolublymounted in the opposite ends of said auxiliary frame, a pulley blockloosely connected to one end et? the latter, a triple pulley block, ahoisting cable connected at; one end to said triple block and passingaround the pulleys therein and pulleys in said main and auxiliarytrames. a gripping or clutchinge lever pivotally lnounted in one end ofsaid auxiliary frame and adapted to be engaged thereby with tbe hoistingcable when the hoisting power is released therefrom. and means todisengage said gripping or clutching level' from said cable.substantially as described.

Si. A hoisting apparatus comprising a main pulley trame, pulley wheelsjournaled in the lower end thereof. an auxiliary pulley trame pivotallymounted in said main traine. pulley wheels `iournaled in the oppositeends of said auxiliary frame. a pulley block loosely connected to oneend ot the latter. a triple pulley block. a hoisting cable connected atone end to said block and passing around the pulleys therein and pulleywheels in said main and auxiliary frames, a clutch or gripping leverpivotally mounted in one cud ot said auxiliary trame, said lever havingformed therein a cam slot to enl gc a tixed pili or bolt in said niainframe whereby upon t e release ot" tbe hoisting power from said cablesaid auxiliary trame will be tilted by the weight; of the load to causesaid clutching or gripping lever to engage and clamp said hoisting'cable between the free end of aid lever and the pulley in the adjacentend ot said auxiliary frame. and means to release. said clutch lever.substantially as described.

4. A hoisting apparatus comprising a main pulley frame. pulley wheelsjournaled in the lower end thereof. an auxiliary pulley trame pivotallymounted in said main traute, pulley wheels iournaled in the oppositeends ot' said xiliary trame. a pulley block loosely connected to one endotz the latter. a triple pulley block. a hoisting cable connected at oneend to said block and passing around the pulleys therein and pulleywheels in said main and auxiliary frames, a clutch or gripping leverpivotally mounted in one end ot' said auxiliary tranie. said lcvcrhaving formed therein a cam slot to engage a tixed pin or bolt in saidmain frame whereby upon the release ot the hoisting newer from saidcable said auxiliary trame will be tilted by the weight of the load tocause said clutching or grip ping lever to engage and clamp saidhoisting cable between the free end ot iid lever and the pulley in theadjacent, end of said auxiliary trame, a fulcrum arm on said main trame,a bellfcrank lever pivotally mounted on the adja` cent end ot saidauxiliary pulley trame. one arm ot' said bell-crank lever beingpivotally connected to said i'ulcruni arm. a releasing lever pivotallymounted on said main frame and loosely engaged with the opposite arm ol'said bell-crank lever' whereby when said releasing lever is actuated.said bell-crank level' will tiltl or rock said auxiliary pulley frameand thereby disengage said i'ulcrum level' from said hoisting cable andan operating cord connected to said releasing lever, substantially asdescribed.

vIn testimony whereof l have hereunto set my hand in presence of twosubscribing witnesses.

CARL A. OLSON.

Witnesses OLUF Ganssn'r, J. 0. Hauenxxn.

